ftrace - Revision history

Vegard: add category

2022-10-07T14:37:04Z

add category

← Older revision		Revision as of 14:37, 7 October 2022
Line 22:		Line 22:
	cp trace /tmp/trace.txt		cp trace /tmp/trace.txt
	</source>		</source>

			[[Category:Linux kernel]]

Vegard: fixes

2022-10-07T14:14:15Z

fixes

← Older revision		Revision as of 14:14, 7 October 2022
Line 12:		Line 12:
	echo $func > set_graph_function		echo $func > set_graph_function
	echo 1 > tracing_on		echo 1 > tracing_on
			echo > trace

	# do thing here		# do thing here

	echo 0 > tracing_on		echo 0 > tracing_on
			echo nop > current_tracer

	# save trace		# save trace

Vegard: fix

2022-10-07T14:09:46Z

fix

← Older revision		Revision as of 14:09, 7 October 2022
Line 10:		Line 10:
	echo 0 > tracing_on		echo 0 > tracing_on
	echo function_graph > current_tracer		echo function_graph > current_tracer
	echo set_graph_function > set_graph_function
	echo $func > set_graph_function		echo $func > set_graph_function
	echo 1 > tracing_on		echo 1 > tracing_on

Vegard: new page

2022-10-07T14:08:34Z

new page

New page

== Trace a single system call ==

This generates a function graph trace of a specific function and its callees:

<source lang="Bash">
# function to trace
func=ksys_mount

cd /sys/kernel/debug/tracing/
echo 0 > tracing_on
echo function_graph > current_tracer
echo set_graph_function > set_graph_function
echo $func > set_graph_function
echo 1 > tracing_on

# do thing here

echo 0 > tracing_on

# save trace
cp trace /tmp/trace.txt
</source>